I am in Outlook 2016 on Windows 10 and I access an office 365 group. I highlight multiple emails and right click and select convert to pdf, however I get the error "Invalid Selection. Please select one or more emails in the explorer and try again." This works perfectly fine in the inbox and all folders, just not within an Office 365 group. We need to do this because we need to export emails from groups just like we do in our regular inbox.